Electric motor and dynamo machine



Jar:e 2l, 1930. cfg.. DAUN ELEGTRIC MOTQR AND DYNAMO MACHINE Filed May18, 1Q28 ff ifa' 75% F1747- f- 6 ff fff/ n .1 itl. lil/M Patented Jan.21, 1930 UNITED STATES PATENT ori-uca CARL LIVINGSTON DAITN, 0FMILWAUKEE, WISCONSIN, ASSIGNOR TO SILCOCK AIRAJDI- ATCB CORP., OFMILWAUKEE, WISCONSIN, A. CORPORATION OF WISCONSIN ELECTRIC MOTOR ANDDYNAMO MACHINE Application iled May 18, 1928. Serial No. 278,872.

This invention relates to certain new and useful improvements inelectric motors and dynamo machines and is a continuation in part of myPatent Number 1,677 ,4:33.

In addition to the objects outlined. in the above-mentionedapplications, it is a further object of this inventlon to provideimproved means for positively excluding extraneous matter from the liveparts of the machine.

A more specific object of this invention resides in the provision of animproved machine of the character described in which the runner orrotating member has an inwardly extended annular flange traveling withinan annular groove in a stationary sleeve or shield 'member and avertical annular flange extending beyond the annular groove to form apositive seal against the entrance of extraneous matter into the liveparts of the machine between the runner or rotating member and thestationary cooperating member.

And a still 'further object of this invention resides in the provisionof an improved device of the character describe-d having a fume tightjoint between the runner and stationary member.V

With the above and other objects in view which will appear as thedescription proceeds, my invention resides in the novel construction,combination and arrangement of parts substantially as hereinafterdescribed and more particularly defined by the appended claims, it beingunderstood that lsuch,

changes in the precise embodiment of the hereindisclosed invention maybe made as come within the scope of the claims.

In the accompanying drawing, -I have 1llustrated two complete examplesof the physical embodiment of my invention constructed according to thebest modes I have so far devised for the practical application of theprinciples thereof, and in which:

Figure 1 is alongitudinal, sectional view, with parts in elevation,taken through an electric motor and dynamo machine equipped with myinvention;

Figure 2 is an enlarged, fragmentary, sectional view, taken transverselythrough the stationary sleeve or shield and the cooperating runner orrotary member;

' Figure 3 is an enlarged, fragmentary view of one portion ofan electricmotor and dynamo machine illustrating a slightly modified form of myinvention; and

Figure 4 is a front plan view of the runner and rotary enclosing memberwith parts brfken away and illustrating structural detai s.

Referring now more particularly to the accompanying drawing, in whichlike numerals designate like parts throughout the several views, 5designates an electric motor and dynamo machine of any conventionaldesign and construction having a stator 6 including a core 7 providedwith windings 8 and a rotor 9 fixed to a shaft 10 journaled in thebearings 11 of end frame members 12 which, with a. central frame unit13, confine and hold the parts together. In conventional open typeelectric motors and dynamo machlnes, the heat generated by the motorwhen in operation is carried ofi by air entering spaces 14 between thespider arms 15 supporting the bearings, the air being expelled throughoutlets 16 in the frame unit 13.

Frequently, air impellers of any conventional design rotate with theshaft 10 to increase the velocity of the cooling air passing through themachine and in the application of my improved device, the air impellersare removed and replaced by runners or members 17 of novel design,enclosing the live parts of the machine at each end, as will be laterdescribed. Each member 17 consists of a hub portion 18 and a radiallyfluted or pleated, approximately disc shaped member 19 in the centralaperture of which the hub portion is suitably secured.l The periphery ofmember 17 has an annular flange 2O extended inwardly to cooperate with asleeve or cylinder member 21 secured to the stator or frame, as at 22,and extended over the outermost ends of -the rotorV by cap screws or4other means 24 passed through the hubs 18 and threaded in the rotor,and are of substantially conical shape to extend inwardly of the planeof the outer ends of the coils 23 to be in close thermal contact withthe live parts of the machine so that the heat generated thereby isreadily thermally conducted through the members.

The sleeves 21 and the members 17 are preferably constructed of metalhaving a relatively high degree of thermal conductivity and the flanges2O are soldered, brazed or otherwise secured to the outer periphery ofthe fluted members 19, the hubs 18 being cast, brazed or otherwisesecured thereto thus forming a very rigid construction.

The pleats or ilutes provide a series of radial channels 19 which drawthe air thereto at their center portions impelling the same outwardly athigh velocity to be discharged over the entire periphery of the runner.The pleats or flutes further provide large internal and external surfaceareas to assure a maximum of cooling surface Within' a minimum diameterand as the members are in close proximity to the source of heat, the aircontacting therewith and passing thereover eiiiciently dissipates theheat generated by the machine and thermally conducted through themembers.

The outer marginal edge of each sleeve 21 is preferably struckrearwardly, as at 25, inwardly, as at 26, and forwardly parallel to butslightly spaced from the Wall 25,asat2.7, to provide an annular channelor trap 28 in which the flange 20 runs with the necessary clearance, butat the same time excluding all dirt and other extraneous matter in thesurrounding atmosphere from entering the live parts of the machinebetween the runners I and sleeves. All extraneous matter entering thespaces 14 is discharged from the peripheries of the members 17 over thesleeves 21 and out through the openings 16. To provide furtherprotection against dirt Working past the trap formed by the fla-nge 20and the trough or groove Q8, an annular ring or flange 29 is secured tothe front face of each member 17 with its peripheral edge portion 30extended beyond the trap or channelQS so that any extraneous mattercoming into contact with the member 17 is safely guided past the trap orchannel and out of the motor housing through the outlets 16.

In Figure 3, a slightly modified form of my invention is illustrated inwhich a fume tight seal is provided between each runner and sleeve by afelt or other packing member 31 which, in the present embodiment, extends about the flanges 2O and 30 being secured thereto, as at 32, withits middle portion 33 substantially free to iex under centrifugal forceand engage the rounding portion 34 of the sleeve 21 adjacent the annulartrough 28.. The member 31 is preferably saturated with a suitable oil toprovide lubrication and as the runner rotates the loose portion 33 isthrown against the sleeve 21 by centrifugal force and provides a fumetype any open type' electric motor and dynamomachine may loe readilyconverted into a fully enclosed type without in any way impairing itseiiiciency.

What l claim as my invention is:

1. ln an electriemotor and dynamo machine including a rotor and astator, a sta tionary member having an annular trough in its outer faceportion, an imperforate uted member, the flutes of said member forminginternal and external surface irregularities to provide relatively largeinternal and external cooling areas; an annular flange carried by thetluted member adjacent its periphery and extended into said annulartrough to, with the stationary member, substantially enclose the liveparts of the machine, and a second peripheral flange carried by the utedmember and of a diameter greater than the largest diameter of saidtrough.

2. ln an electric motor and dynamo ma.- chine including a rotor and astator, a stationary member having an annular trough in its outer faceportion, an imperforate tinted member, the flutes of said member forminginternal and external'surface irregularities to provide relatively largeinternal and external cooling areas, anannular flange member carried bythe luted member adjacent its periphery and extended into said annulartrough to, with the stationary member, substantially enclose the liveparts of the machine, a second peripheral iiange carried by the tintedmember and of a diameter greater than the largest diameter of saidtrough, and a fume excludin means cooperating with said stationary memer and iuted member to exclude Jfumes from entering the live parts ofthe-machine.

3. In an electric motor and dynamo machine including a rotor and astator having windings, the ends of which project beyond the rotor, astationary sleeve extended over the ends of the windings and having anannular'channel concentric with respect to the rotor, a fluted memberrotatable with the' rotor, the flutes of said member forming internaland external surface irregultirities to provide relatively largeinternal and external cooling areas, an annular Iiange carried by thefiuted member and extended into the channel of the stationary sleevewhereby said sleeve and rotatable member substantially enclose .the liveparts of the machine,

and a. second flange carried by,the rotatable ly over the ends of thewindings and having an annular channel concentric with respect to therotor, a fluted member rotatable with the rotor, the flutes of saidmember forming internal and external surface irregularities to providerelatively large internal and external cooling areas, an annular angecarried by the fluted member and extended into the annular channel ofthe stationary sleeve where'- lby said sleeve and rotatable membersubstantially enclose the live parts of the machine, a second flangecarriedby the rotatable member and overlapping the sleeve externally ofits annular channel whereby extraneous matter striking lthe rotatablemember is discharged therefrom over the stationary member being guidedin its passage over the channel by said flange, and a packing memberdisposed at the juncture between the stationary sleeve and rotarymember.

5. In an electric motor and dynamo machine including a rotor and astatorhavin windings, the ends of which project beyon :the rotor, astationary sleeve extended over the ends of the windings and having anannular channel concentric with respect to the rotor, a luted memberrotatable with the rotor, the flutes of said member forming internal andexternal surface irregularities to provide relatively large internal andexternal cooling areas, an annular flange carried by the luted memberand extended into the annular channel of the stationary sleeve wherebysaid sleeve andA rotatable member substantially enclose the livezpartsof the machine, a second flange carrled by the rotatablemember andoverlapping the sleeve member externally of its channel whereby'extraneous matter strikin the rotatable member isdischarged there romover the sleeve being guided in its passage over the. channel by saidsecond flange, and a packing member disposedat the juncture `between thesleeve and rotary member, said packin member being thrown outwardlyagainst t e stationary sleeve b centrifugal force to provide asubstantially ume tight joint therebetween.

6. In an. electric motor and dynamo machine including a rotor and astator, a member connected with the stator and `extended thereover andhaving an annular trough at its` outer periphery, a iuted memberrotatable with the rotor and with the stationary member protecting thelive parts of the machine from .extraneous matter in the surroundingatmosphere, the flutes of said memberv forming internal and externalsurface irregularities to provide relatively large internal and externalcooling areas, and an annular flange carried by the luted membercooperating with the annular trough to form a trap and extended over thetrough ofthe stationarymember to guide matter passed over the peri heryof the uted member past the trap of -t e stationary member.

7. In an electric motor and dynamo ma'- chine including -a rotor and astator, a stationary member having an annular trough in itsouter faceportion, an imperforate fluted member, the flutes of said member forminginternal and external surface irregularities to provide relativelylargeinternal and external cooling areas, and a peripheral flange carried bythe iuted member cooperating with the annular trough and having a partof a diameter greater than the largest diameter of said trough wherebthe luted member with the stationary membe tially encloses the liveparts of the machine A and extraneous matter is positively guided pastthe annular trough.

8. In an electric motor and dynamo machine including a rotor and astator havin windings, the ends of which project beyon the rotor, astationary sleeve extended over the ends of the windings and having anannular trap at, its outer periphery and concentric with respect to therotor, a fluted member rotatable with the rotor, the flutes of saidmember forming internal and external surface irregularities to providerelatively large internal and external cooling areas, and

an annular flange carried by the fluted memf ber and projected over theannular trap of the stationary sleeve whereby said sleeve and rotatablemember substantially enclose the live parts of the machine to protect'the same from extraneous matter in the surrounding atmosphere.

In testimony whereof I have hereunto affixed my ature.

RL LIVINGSTON DAUN.

